Key Feature: smart and elegant design,featured by the durable PU seat surface anti-rust iron stand with electroplate, more durable for use PU seat surface is easy to clean can adjust the most suitable height by the hydraulic lift of chair 5 free-swiveling castors(360 degree swivel),more convenient to remove sponge cushion offers maximum comfort iron stand with foot rest, in accordance with user-friendly design Cylinder is approved by SGS which means the chair is safer for use